Source:http://ftr.wot-news.com/2014/02/07/removal-of-battletier-12-what-does-it-mean/
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Hello everyone,
大家嚎， 

there seems to be some confusion about the announced removal of battletier 12 in 8.11 (on Tuesday), so I’d like to shed some light on the issue. Personally, I was just as confused as you are, but in the end, I think I understood what the developers meant by this and it is a pretty elegant solution indeed.
貌似自从前几天说过要移除第12级战斗等级之后，就一直存在着一些迷惑的声音，所以我决定对这个问题进行一下说明。就我个人来讲，我和你们有着差不多的疑问。但是在最后，我想我明白了为什么开发团队要这么搞，而这又是一个多么简单明了的解决方案。

For starters, what does it mean for tier 8 tanks? Will they meet tier 10′s more often? The answer is “no”. Balance-wise, it means absolutely nothing. Why does it mean nothing? Well, because there is this rule that a vehicle has to be spread equally over battletiers, that trumps everything else. In other words, it is a game mechanism that you will spend equal amount of time on all the battletiers. Keep in mind that this rule does work over your entire tank statistic, so “streaks” of you at the top (or bottom) are completely possible (I better say this before anyone starts moaning again about “rigged” MM). By the way, remember that “famous” post by a developer, where he said the better you play, the worse MM you get? Yea, that’s garbage, it was debunked several times even by Storm.
对于初心者来说，这对8级车意味着什么？它们会不会碰见更多的10级车？答案是“不会的”。从平衡角度来讲，这么做其实一点影响都没有。为什么呢？因为分房时有一条规则，需要每辆车的战斗都要均匀的分布在各个战斗等级中， 而这条规则又凌驾于所以规则之上。换句话说，这是游戏的一种机制，让你在游戏中所有的战斗等级上花费同样的时间进行游戏。请记住这条规则适用于你的整个坦克的数据，所以你“连续”的做了班长（或者作为垫底车）进入战斗都是有可能的（我最好先把这事挑明了，省得有人会抱怨说分房都是“内定的”）。顺便一说，记不记得有个开发团队乘员非常“著名”的一贴，里面说你玩的越好，分房越烂？没错，那东西就是坨屎，它甚至都被Storm揭穿了好几次。

Let’s have a look at the tier 8,9 and 10 battletier spreads.
以下是8级，⑨级，还有10级车的战斗等级分布图

Removing battletier 12 will mean two things. First, it’s a de-facto buff of tier 8 light tanks, their MM spread will be limited by one, which means the time they spent on that battletier will be distributed to the (easier) battletiers. Second, as I said, it means nothing for tier 8 vehicles (they won’t get any worse MM), but they will get shorter queues.
移除第12级战斗等级意味着以下两件事。 首先，这对于8级轻坦来说绝对是个Buff，它们的MM分部就会少一级，也就意味着他们在那个战斗等级上所花费的时间会被分配到其他（简单一些的）战斗等级上。第二，如同我说过的一样，这对于8级车其实没有影响（因为分房没有变差），但是他们的排队时间会变短。

You see, tier 8 is very popular. Obviously there are the “grind machines” (tier 8 premiums), but tier 8 is also the first tier, where you spend a significant amount of time playing a vehicle. In short, there are many of those tanks in the queue and that caused long tier 8 queues on Russian server. I haven’t noticed the same issue on EU server, but it can happen I guess.
你看，8级车很火热的。8级车都是“打钱机器”（8级金币车），但是8级又是你的第一个要花费大量时间去玩的坦克。总而言之，这里有许多在排队8级车，这也就让毛服的8级车等待时间变得很长。我在欧服上没有注意到这个问题，但是我觉得这情况有可能会发生。 

So, why are there long queues on tier 8? After all, there are tons of tier 8 tanks in the queue, let’s just match them together, right? Wrong. This is where the even battletier spread rule I mentioned above works against you – yes, there are tons of tier 8 tanks waiting in the queue, but all of the waiters are not waiting on free server space or whatever, they are waiting for tier 9 and 10 tanks, because even spread rule forces them into hightier battles once in a while. So, the reason of tier 8 waiting queues is not the abundance of tier 8 tanks, it’s the lack of tier 9 and tier 10 tanks so to say.
为什么只有8级车的排队时间这么长呢？你看，队列里有这么多的8级车，把他们都撮合到一起然后开纯8级房就好了嘛，对吧？不成。这就是我在上面提到的战斗等级分布开始起作用的时候—没错，在队列中的确是有一大堆的8级车，但是所有在等待的人并不是在等空闲的服务器位置或者其他什么鬼东西，他们其实是在等⑨级和10级车，因为战斗等级分布这条规则要求他们要进入高级房打一会。所以，8级车等待时间过长的原因并不是过量的8级车，而是⑨级和10级车过少的问题。

Now, why would tier 10 tanks be missing from the tier 8 queue? Simple. They have their own extra battletier, battletier 12 (those battles with tier 10′s only plus a few tier 8 scouts? Yea, that’s battletier 12). This is their “own league” no other tier can touch and by removing it, you “free up” all those tier 10 tanks, that would otherwise be occupied on battletier 12, to be mixed in with the tier 8′s. Again, please keep in mind that this does NOT mean you will see more tier 10′s in your tier 8 tank (even battletier spread rule!), it means only that the tier 8 waiting times will be shorter due to the influx of tier 10 tanks, for which the tier 8′s were originally waiting.
现在要来说说为什么8级车的队列中老是少10级车呢？很简单。因为10级车有自己的额外的战斗等级，第12级（就是只有10级车，然后一些8级眼车的分房。没错，那就是第12级分房）。这是他们自己的“联盟”，其他等级的车都进不去。而通过移除第12级呢，这些10级车就被解放了出来，而这些车原本应该呆在第12级中的，他们现在就被拉去和8级车打了。我再重申一次，请记住这么做（移除第12级）并不意味着你在玩8级车时会看到更多的10级车（战斗等级平均分布！），它只意味着8级车的等待时间由于10级车的加入而变短了，而这（10级车）正是以前8级车在等的东西。

Please note two things:
请注意以下两点： 

– it is also a de-facto buff for tier 10′s (one less MM tier spread)
这对于10级车也是确确实实的Buff（少了一个分房等级）

– it however does NOT mean it will be impossible to see a battle with tier 10′s on both sides only, these will however be more rare
这并不意味着以后就没有纯10级房了，这只意味着纯10级房会更加少见罢了。